The M1/M2 mystery parts were annoying because they're not clearly marked on the instruction sheet.
I swapped out the incorrect rear left turret shield plate for the correct M2 plate, but left the radio out until everything is painted. The smoke grenade launchers took longer to finish than I had expected; I think I'll have to deviate from the artwork and put them towards the front of the turret (as in the real world tank) rather than towards the rear - the mount is shaped to follow the forward turret angles.
While trying to figure out the "sleeve" for the gun barrel, I made a plastic extension that looked OK, but the gun was still loose - then it hit me; why not swap the rear of the Merkava's barrel with the rear of the kit's gun barrel? I kept the length the same and it fits without being loose. The white ring is where I joined the two. I used Tamiya tape to enhance the barrel straps:

Here's where I left off today. I made the IR baffles for the exhaust (and made sure they clear the turret):


It's not clear from the illustration if the shield is flush with the front of the toolbox or against the edge of the tank. There are convenient empty mounting holes right where the shields are, so that's where i put them.
Tomorrow I'll finish the MG and a few other parts, then start thinking about primer and paint.